No one said that extreme micromanaging would be easy, but I believe it to be the next step to next-level hunter play.
Not dying to mechanics and proper target switching should be a given; those are the most basic requirements a raider should have. Good players can do all that while maintaining a near optimal rotation. It's my belief (again, MY belief only, not enforcing it on others) that the best players line up their shots to procs, pool focus for when multiple procs align,
while keeping their rotation as tight as possible
Ideally your procs and shots come off cd all at the same time (I joke with my fellow raiders when this happens, "the stars aligned" lol) but of course real life isn't like that. The ability to make the best decision on the fly when to delay and when to maximise uptime; that's the difference between a good player and a great player.
I personally don't delay my BW when no trinket procs are up. when I DO slightly delay, it is when the trinkets have already procced, then I time my BW for the last 10-11sec. Since BW is on a 1min cd, it's a little forgiving to delay it by a little bit.
As for KC, I don't delay it at all unless I'm in the final 10 seconds of renataki, at which point I will try to look at it as a BW-esque window. This means trying to fit 2 KCs, and timing it at 2s and 8s.